Dominant 7th chord (7): formula 1 3 5 ♭7. A major triad with a minor 7th: the tritone between its 3rd and ♭7 pulls toward the tonic. The V chord of every key, and the I chord of the blues.
Dominant 7th chord (7): formula 1 3 5 ♭7. A major triad with a minor 7th: the tritone between its 3rd and ♭7 pulls toward the tonic. The V chord of every key, and the I chord of the blues.